Jump Ropes by Jim Jayes

Two paper bags are shown. There is a 2
foot red rope in one bag and a 2 foot white rope in the other. Snap
your fingers and the ropes change places. Snap again and they jump back
to where they started. The spectators think you have an extra length of
rope in each bag - they are correct! You reach into the bags and bring
out two 24 inch, red and white striped ropes, leaving the bags
completely empty!